Abstract
In the production of wall tiles, trends are moving toward larger-format wall tiles. Moisture expansion of larger-format wall tiles is one of the most important technological parameter that determine the quality of their service life. Clay, kaolin, quartz, carbonate and less fluxing materials are generally used in monoporosa tile recipes. In this study, alkali containing raw materials such as perlite, rhyolitic tuff, granite and nepheline syenite, were used instead of quartz and kaolin in the recipes. The investigated bodies are fired under industrial fast firing cycle at 1150 °C—50 min. Firing shrinkage, water absorption and color values (L*, a*, b*) of alkaline raw materials and bodies were measured. Thermal expansion coefficient and moisture expansion values of the bodies were determined by dilatometer and the sintering behavior of the representative formulations was evaluated using a double-beam non-contact optical dilatometer (ODHT). Phase and microstructural analyses were performed by XRD and SEM, respectively. As a result, the analytical data obtained from this study revealed that the alkaline/flux materials which have more or less similar chemical compositions, represent distinctly different physico-mechanical behavior. According to the petrographical examinations, whereas the holocrystalline textured alkaline materials such as nepheline syenite and granite decrease moisture expansion, the use of amorphous-glassy textured raw materials such as perlite and rhyolitic tuff increase moisture expansion in monoporosa tile body manufacturing. Using of the alkali raw materials as a partial replacement of quartz also enables the development of lower thermal expansion bodies.
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Kayaci, K. Effect of fluxing raw materials on moisture expansion of monoporosa wall tile bodies. J Therm Anal Calorim 146, 1603–1611 (2021). https://doi.org/10.1007/s10973-020-10378-7
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DOI: https://doi.org/10.1007/s10973-020-10378-7